DebugUI.xml

<Ui xmlns="http://www.blizzard.com/wow/ui/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.blizzard.com/wow/ui/
..\FrameXML\UI.xsd">
    <!-- This script turns on verbose messages in the FrameXML log -->
    <Script>
        FrameXML_Debug(1);
    </Script>
    <!-- This button allows you to hot reload the UI at runtime -->
    <Button name="ReloadButton" parent="UIParent">
        <Size>
            <AbsDimension x="128" y="32"/>
        </Size>
        <Anchors>
            <Anchor point="BOTTOMRIGHT">
                <Offset>
                    <AbsDimension x="-192" y="64"/>
                </Offset>
            </Anchor>
        </Anchors>
        <Scripts>
            <OnClick>
                ReloadUI();
            </OnClick>
        </Scripts>
        <NormalTexture inherits="DialogButtonNormalTexture"/>
        <PushedTexture inherits="DialogButtonPushedTexture"/>
        <HighlightTexture inherits="DialogButtonHighlightTexture"/>
        <NormalText inherits="DialogButtonNormalText" text="Reload"/>
        <HighlightText inherits="DialogButtonHighlightText" text="Reload"/>
    </Button>
</Ui>